Question

please solve this and help me

Answer 1

refractive index = sin i  / sin r 
root 3 = sin i / sin 30 
sin i = root 3 x sin 30 
sin i = root 3 x 1/2
sin i = root 3 / 2 
we know that sin 60 is root 3 / 2 
therefore the angle of incidence is 60°

or

refractive index=sin i\sinr.     Root 3 =sin i/sin30.                 Sin 30 =1/2.                             root 3=Sin i/1/2.                      Root 3*1/2=sin I.                      root 3/2 = sin i .                         Sin 60 = root 3/2.               Hence and is 60.

Answer 2

The angle of incidence is 60